Caustic soda
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Caustic soda

Molecular formula------NaOH

Molar mass------39.9971 g/mol

Appearance ------white solid, hygroscopic

Density------ 2.13 g/cm3

Melting point-----323 °C, 596 K, 613 °F

Boiling point------1388 °C, 1661 K, 2530 °F

Solubility in water ------111 g/100 ml (20 °C)

Solubility in ethanol-------13.9 g/100 mL

Solubility in methanol------23.8 g/100 mL

Sodium hydroxide (NaOH), also known as lye and caustic soda, is a caustic metallic base. It is used in many industries, mostly as a strong chemical base in the manufacture of pulp and paper, textiles, drinking water, soaps and detergents and as a drain cleaner.